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copied!<p>I'm sure this is wrong for SO many reasons and please feel free to tell me how many WPF laws I've violated but.. I solved the same problem by creating my own BindableDoubleAnimation.</p> <pre><code>public class BindableDoubleAnimation : DoubleAnimationBase { DoubleAnimation internalAnimation; public DoubleAnimation InternalAnimation { get { return internalAnimation; } } public double To { get { return (double)GetValue(ToProperty); } set { SetValue(ToProperty, value); } } /// <summary> /// Dependency backing property for the <see cref="To"/> property. /// </summary> public static readonly DependencyProperty ToProperty = DependencyProperty.Register("To", typeof(double), typeof(BindableDoubleAnimation), new UIPropertyMetadata(0d, new PropertyChangedCallback((s, e) => { BindableDoubleAnimation sender = (BindableDoubleAnimation)s; sender.internalAnimation.To = (double)e.NewValue; }))); public double From { get { return (double)GetValue(FromProperty); } set { SetValue(FromProperty, value); } } /// <summary> /// Dependency backing property for the <see cref="From"/> property. /// </summary> public static readonly DependencyProperty FromProperty = DependencyProperty.Register("From", typeof(double), typeof(BindableDoubleAnimation), new UIPropertyMetadata(0d, new PropertyChangedCallback((s, e) => { BindableDoubleAnimation sender = (BindableDoubleAnimation)s; sender.internalAnimation.From = (double)e.NewValue; }))); public BindableDoubleAnimation() { internalAnimation = new DoubleAnimation(); } protected override double GetCurrentValueCore(double defaultOriginValue, double defaultDestinationValue, AnimationClock animationClock) { return internalAnimation.GetCurrentValue(defaultOriginValue, defaultDestinationValue, animationClock); } protected override Freezable CreateInstanceCore() { return internalAnimation.Clone();; } } </code></pre> <p>I'm now free to use bindings for the To From properties.</p> <pre><code><local:BindableDoubleAnimation Storyboard.TargetProperty="Width" From="0" To="{Binding ActualWidth, RelativeSource={RelativeSource AncestorType=Window}}"/> </code></pre>

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